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SEGMENT INFORMATION - Segment Results (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Information
Number of reportable segments | segment			4
Reportable segment results
Revenues	$ 415,439	$ 355,651	$ 1,096,504	$ 961,616
Segment Adjusted EBITDA Expense	239,350	216,750	651,571	638,989
Segment Adjusted EBITDA	154,589	132,701	400,502	306,458
Total assets	2,148,975	2,231,340	2,148,975	2,231,340	$ 2,166,016
Capital expenditures	33,035	18,575	$ 88,661	102,820
Coal Operations
Segment Information
Number of reportable segments | segment			2
Number of mining complex | segment			7
Illinois Basin
Reportable segment results
Revenues	231,093	210,319	$ 640,260	551,978
Segment Adjusted EBITDA Expense	149,666	131,014	415,423	399,664
Segment Adjusted EBITDA	69,305	75,583	197,601	141,583
Total assets	703,060	799,936	703,060	799,936
Capital expenditures	19,081	3,815	47,997	44,073
Appalachia
Reportable segment results
Revenues	154,944	132,310	384,286	367,523
Segment Adjusted EBITDA Expense	92,312	86,701	240,494	240,846
Segment Adjusted EBITDA	52,726	43,105	125,873	120,686
Total assets	422,504	461,751	422,504	461,751
Capital expenditures	12,531	14,541	34,579	57,798
Oil & Gas Royalties
Reportable segment results
Revenues	21,191	9,721	52,798	31,831
Segment Adjusted EBITDA Expense	2,639	849	7,116	2,851
Segment Adjusted EBITDA	19,080	8,898	46,405	29,534
Total assets	601,695	616,491	601,695	616,491
Coal Royalties
Reportable segment results
Revenues	13,456	11,448	36,410	29,602
Segment Adjusted EBITDA Expense	4,258	5,161	13,157	12,649
Segment Adjusted EBITDA	9,198	6,287	23,253	16,953
Total assets	289,100	291,854	289,100	291,854
Capital expenditures	30		30
Other and Corporate and Elimination
Reportable segment results
Revenues	(5,245)	(8,147)	(17,250)	(19,318)
Segment Adjusted EBITDA Expense	(9,525)	(6,975)	(24,619)	(17,021)
Segment Adjusted EBITDA	4,280	(1,172)	7,370	(2,298)
Total assets	132,616	61,308	132,616	61,308
Capital expenditures	1,393	219	6,055	949
Operating segments
Reportable segment results
Revenues	415,439	355,651	1,096,504	961,616
Operating segments | Illinois Basin
Reportable segment results
Revenues	231,093	210,319	640,260	551,978
Operating segments | Appalachia
Reportable segment results
Revenues	154,944	132,310	384,286	367,523
Operating segments | Oil & Gas Royalties
Reportable segment results
Revenues	21,191	9,721	52,798	31,831
Operating segments | Coal Royalties
Reportable segment results
Revenues		42		47
Operating segments | Other and Corporate and Elimination
Reportable segment results
Revenues	8,211	3,259	19,160	10,237
Elimination | Coal Royalties
Reportable segment results
Revenues	13,456	11,406	36,410	29,555
Elimination | Other and Corporate and Elimination
Reportable segment results
Revenues	$ (13,456)	$ (11,406)	$ (36,410)	$ (29,555)

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